The sidac is a silicon bilateral voltage triggered switch with greater power-handling capabilities than standard diacs. Upon application of a voltage exceeding the sidac breakover voltage point, the sidac switches on through a negative resistance region to a low on-state voltage. Conduction continues until the current is interrupted or drops continues until the current is interrupted or drops.

Applications:
1. High-voltage lamp ignitors
2. Natural gas ignitors
3. Gas oil gnitors
4. High-voltage power supplies
5. Xenon ignitors
6. Over-voltage protector
7. Pulse generators
8. Flurescent lighting ignitors
9. HID lighting ignitors